feign接口上传文件时报错FileUploadException: the request was rejected because no multipart boundary was found

使用版本：

• spring-cloud-alibaba-dependencies: 2021.0.4.0
• spring-cloud-dependencies: 2021.0.4
• spring-boot-dependencies: 2.6.11
• feign-form-spring: 3.8.0
• feign-form: 3.8.0

问题描述：

学习黑马的学成在线时，使用Feign远程调用上传文件服务时报错FileUploadException: the request was rejected because no multipart boundary was found

原因是在定义feign接口时使用了@RequestParam注解，应该改为@RequestPart注解

错误代码：

@PostMapping(value = "/media/upload/coursefile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    String upload(@RequestParam("fileData") MultipartFile fileData,
                  @RequestParam(value = "objectName", required = false) String objectName);

修改为：

@PostMapping(value = "/media/upload/coursefile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    String upload(@RequestPart("fileData") MultipartFile fileData,
                  @RequestParam(value = "objectName", required = false) String objectName);